Cutter-head bit.



No. 700,552. Patented May 20', I902. A, 00050 5. s. SHIMEB.

CUTTER HEAD BIT.

(Application filed Feb. 21, 1902.)

3 Sheets-Sheet I.

(No Model.)

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Noam: PEIERS on. moro umu, WASHINGTON. D. c.

No. 700,552. Paientd May 20, I902. H. A. PARIJOE & E. s. SHIMEB.

' CUTTER HEAD BIT.

(Application filed Feb. 21, 1902.)

3 Sheets-Sheet 2,.

(No Model.)

No. 700,552; Patented May 20, I902. H. A. PARDUE & E, s. SHIMER.

CUTTER HEAD BIT.

(Application filed Feb. 21, 1902) 3 Sheets-Sheet 3.

(No Model.)

Tn: norms Pains 00.. nacho-1.1mm. wm momy. n. c.

UNITED STATES:

iEA-TENT OFFICE.

HENRY A. PARDOE AND ELMER S. SHIMER, OF MILTON, PENNSYLVANIA, AS- SIGNORS TO SAMUEL J. SHIMER AND SONS, OF MILTON, PENNSYLVANIA.

c UTTER-H EAAD BIT".

SPECIFICATION forming part of Letters lli ate nt o. 700,552, dated May 20, 1902 Application filed February 2 l '1 9(l2. sarial N0.95,l08. (No model.)

To ctlZ whom it may concern: 4

Be it known that we, HENRYA, PARDQE and ELMER S. SHIMER,-. cit-i zens of 'the United States, residing at Milton,' in theco'unty of Northumberland'and State of Pennsylvania, have invented new and useful Improvements in Cutter-Head Bits ofl which the following is a specification. A

In the Stutzm'an cutter-head for finishing plane snrfaceswith ashea'ring cut bits are employed having a body-formed'of a portion. of a cylinder'and bearinga cutting edge which conforms to one'of the lines of intersection of the-surfaces of two non-parallel intersecting cylinder's'viz., the cylinder of' rotation of the head and the surface offthe inner bore of the bit. WVhile itis easy for the manufacturers to make a'bidwith-t'he,

ways besetand sharpened by the-us'e of a' device described" hereim but which is not claimed, as it forms the subject-matter of a separate-application for patent.

The novel construction usedby usfin carrying out our invention is fully described in this specification, and-claimed and illustrated in the accompanying drawings, forming a part thereof, in which Figure 1 is a perspective of a Stutzm'an cutter-head for making a shearing cut." Fig. 2 is a perspectiveof a bit constructed after the manner of our invention. Fig. 3 is a perspective of a slotted cylinder cut to form two bits. Fig. at is a perspective of our emerywheel-and holder. Fig. 5 is a detail of the bit-holder. j

Like numerals-of referencedesignatelike parts in the different viewsiof the drawings.

The nnmei'a'l.jl rdesignates "a- 'cutter-head, which-comprises a cylindrical hub 2 and. two circular flanges 3. Each of the flanges 3 bears inclined bit-seats 4, having semicircular grooves 5 therein. Seated in these grooves 5 and extending diagonally the head-that is, at an angle to the axis ofr'otation-are bits-. 6, The bits 6 are formed of a fragment of :a' "cylinder a littleless than'half of the whole,-'softhattwo bits may be made out of 5. a complete cylinder, as will appear. The cuttingedgesfl of'the bits' j6 project a little beyond the peripheryof the flanges 3 to permit clearance, and the=heels of the bits are set'inbeyond the periphery. In order that the bit 6 mlayfinish aplane,surface,-it is nec-' essary that the edge 7ficonform to one of the lin'es,of intersection-of a cylinder having a radi'us'equal to the inner bore out of which the bit6-was formed-and a cylinder with a radiu's equ'al to the distance from the-axis of the head l to the edge 7-that is, with a ra dius a little larger than the flanges 3.

In' 'forming abit dot the required shape a steel plate is taken of the proper size to form I a iixed tool, which will cut the edge 7 of the require d curvature. formed the heel 15 is ground off on a curve 16, 8.0 fwHichristhe counterpart of the curve of the After the edge 7 has been edge7 and' parallel to it throughout-that is, the circular arcs intercepted on the cylinder by the'curves 7 and 16 will be constant. To

do this, a machine such as shown in Figs. 5 and 6 is employed, which forms the subjectmatter of a separate application for patent.

In this machine the numeral 17 designates a shaft journaled in boxes 18, mounted on standardsl9. The shaft 17 bears a pulley 0 20 and an emery-wheel 21, held by clampingplates 22. A cross-bar 23, connecting the standard 19, provides a support for angarm 24., having a slot 2 L therein,. e"n ga edl'by a bolt 24, seatediu=-the cross-bar 23.-= ==Aclamp 9 5 27 is formed integral with the outer end of the BERT-2%, which clamp em-braces a stem. 25, formed integral with abit-holde'r'26Z "The holder 26 is semicylindrical and of the same curvature as the bit 6. the holder 26transversely, and mounted to slide within the slot is a semicircular rack 28, I

A slot 26 traverses I00.

having teeth 29 formed on the outer surface thereof, which teeth are engaged by a worm 30, formed on a shaft 31, mounted to be turned by a head 32. A guide-pin 33 is seated in an aperture 34: in the rack 28 to form a guide for the bit 6. There are several of the apertures 34. in which the guide-pin 33 may be placed in grinding partially-worn-out bits.

In operation the bolt 24 is loosened and the arm 24 swung around until the bit-holder 26 is opposite the emery-wheel. One of the bits 6 is then placed in the holder 26 with the sharp edge against the guide-pin 33. The milled head 32 is then turned to operate the rack 28 to bring the heel 15 of the bit in con tact with the emery-wheel. The bit 6 is then reciprocated by hand back and forth in contact with the emery-wheel and the heel 15 ground off on a curve parallel to the curve of the edge 7. Having the heel ground, as above specified, the bit 6 is then reversed to bring the heel 15 in contact with the guide-pin 33 and the edge 7 finished with the emery-wheel. \Vhen this has been completed, the bit 6 is replaced in the cutter-head 1 and used until dull, when it may be easily sharpened to the same shaped edge as before by placing it in the holder 26 with the heel 15 in contact with the guide-pin 28.

We do not wish to be limited as to details of construction, as these may be modified in many particulars without departing from the spirit of our invention.

Having described our invention, What we claim as new, and desire to secure by Letters Patent, is-- 1. A bit for cutter-heads comprising a body having a curved cutting edge and a heel formed on an unbroken curve which. is parallel to and a counterpart of the curve of the cutting edge, the curve of said heel being adapted to form a pattern by which to grind the said cutting edge, substantially as described.

2. A bit for cutter-heads comprising a cylindrical body having a curved cutting edge and a curved heel, the curve of said heel being parallel to the curve of said cutting edge and adapted to form a pattern for grinding the said cutting edge, substantially as described.

3. A cutter-head bit comprising a cylindrical body having a cutting edge conforming to a portion of the curve of intersection of the surfaces of two non-parallel intersecting cylinders and a heel formed on a curve parallel to the curve of said cutting edge, substantially as described.

In testimony whereof We have hereunto set ourhands in presence of two subscribing Witnesses.

HENRY A. PARDOE. ELMER S. SHIMER.

Nitnesses:

W. II. BECK, JOHN A. KUR'ITZ. 

